John Mayer has been hospitalized in New Orleans, Louisiana for an emergency appendectomy.
The Daughters singer was taken to the hospital early on Tuesday, and underwent surgery, according to TMZ.
Mayer had been in New Orleans ahead of a Dead and Company concert scheduled for Tuesday night. That show has since been pulled.
A statement from the band reads: "Early this morning, Tuesday, December 5th, John Mayer was admitted into the hospital for emergency appendectomy forcing the Dead & Company December 5th concert in New Orleans to be postponed."
Dead & Company have two Florida dates remaining on their current tour – on 7 and 8 December. It is not known if those shows will go ahead with or without Mayer.